Browse Prior Art Database

Document Security

IP.com Disclosure Number: IPCOM000088367D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Munzel, HE: AUTHOR

Abstract

Document copying is controlled by an office environment which includes colored typewriter ribbons, an office copier containing colored toner, and colored lens filters for a copier. This document security system employs matched sets of ribbon, toner and filter, wherein each reflects, transmits or absorbs light in the same manner, i.e., each would have the same spectral characteristics as its matched set components within the controlled office environment.

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Document Security

Document copying is controlled by an office environment which includes colored typewriter ribbons, an office copier containing colored toner, and colored lens filters for a copier. This document security system employs matched sets of ribbon, toner and filter, wherein each reflects, transmits or absorbs light in the same manner, i.e., each would have the same spectral characteristics as its matched set components within the controlled office environment.

In a "type, but no copy" environment, for example, only blue ribbon is allowed. All copiers are equipped with a blue lens filter. Since all originals are prepared with blue text, these originals cannot be copied on the blue-lens copiers.

In a "type, and allow copy only from an original" environment, the typewriter ribbon is black. The copier includes red toner and a red lens filter. Thus, copy can be made only from the original, since all copy text will be red, and red text cannot be copied by a copier having a red lens filter.

Other systems using the above concepts will work equally well.

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